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from a low level ofVEE to the same high level ofVDD. Thus, the input and output swings can be selected independently of each other over a 3-to-18V range. Vss may be connected to VEE when no level-shift function is required. For the HCC/HCF 4054B and HCC/HCF 4056B, data are transferred from input to output by placing a high voltage level at the strobe input. Alow voltage level at the strobe input latches the data input and the corresponding output seg- ments remain selected (or non-selected) while the strobe is low.Whenever the level-shifting function is required, the HCC/HCF4055B can be used by it- self to drive a liquid-crystal display (fig. 10 and fig. 12). The HCC/HCF4056B, however, must be used together with a HCC/HCF4054B to provide the com- mon DF output (fig. 14). The capability of extending the voltage swing on the negatve end (this voltage cannot be extended on the positive end) can be used to advantage in the set-up of fig.ll. Fig. 9 is common to all three types.